<https://www.toyotaownersclub.com/forums/topic/207425-cvt-engine-revs-up-to-3k-4k-when-driving-on-a-steep-hille/#comment-1643258>
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"I'm assuming you mean when going DOWN this steep hill - It might be the car 'upshifting' to provide more engine braking to save the brakes a bit.\n \n\n\n\t \n \n"
<https://www.toyotaownersclub.com/forums/topic/207425-cvt-engine-revs-up-to-3k-4k-when-driving-on-a-steep-hille/>